# What Is The Dumas Method Used For? [9 REPLIES FOUND]

2 The method for determining the relative molecular weights of volatile liquids using weighing. It’s is making of thin glass with a narrow neck and a very long neck. It is fully weighed. Air at known temperatureAfter that, a tiny amount of the sample is added to the bulb and it is then heated (in an oven) until the liquid is vaporized. The air is removed. After sealing the tip of the neck, the bulb is cooled to room temperature and then weighed. You can find the volume by adding water to it and then weighing it again. Calculating the volume of vapour can be done if you know the density. We are grateful to Nikeshia Barney, Ibb (Yemen), for sharing this information with us. [2]
Researchers from web.lemoyne.edu Additional information is available. Notes Jean-Baptiste Dumas (1860-1884) developed a method to calculate the molar mass for substances which could be easily converted into vapors. It is still used in laboratory exercises for chemistry students. The Dumas method involves the determination of the mass, volume temperature and pressure of a substance during its vapor phase. Modern Dumas methods use the ideal gas law to determine the molar mass. This is how the experiments are done. Dumas did not develop the concept of the’s Mole. On the basis of relative gas density, Dumas computed the molar masses or rather relative molecular mass. The ratio of a vapor to hydrogen is equal to its density multiplied by hydrogen’s under similar conditions. This method is based on Avogadro’s hypothesis that similar gases contain equal numbers of molecules. Dumas knew how to modify a measured density to indicate a change in pressure, namely using Boyle’s law. He also knows how adjust the temperature using Charles’ law. We are grateful to Kiernan Hand who shared this information with us. [3]
Notes Jean-Baptiste Dumas (1860-1884) developed a method to calculate the molar mass for substances, which could be easily converted into vapors. It is still used in laboratory exercises for chemistry students. The Dumas method involves the determination of the mass, volume temperature and pressure of a substance during its vapor phase. Modern Dumas methods use the ideal gas law to determine the molar mass. This is how the experiments are done. Dumas was not the first to develop the notion of “the’s mole”. On the basis of relative gas density, Dumas computed the molar masses or rather relative molecular mass. A vapor’s molar mass relative to hydrogen was equal to its density divided by the hydrogen in comparable circumstances. This method is based on Avogadro’s hypothesis that similar gases contain equal numbers of molecules. Dumas knew how to modify a measured density to indicate a change in pressure using Boyle’s law, and Charles knows how adjust the temperature using Charles’ law. [4]
Use a utility clamp attached to a Erlenmeyer flask measuring 125 mL. Put it into a 600 mL saucepan. You can pour water around the flask’s outside until it is nearly full. Allow room to simmer. You must ensure that the water does not get into your flask. Add a few boiling chips and the flask to the water. Heat the water Bring the mixture to a boil over a Bunsen-burner. Remove the clamp from your flask while the water heats and allow it to dry thoroughly. Paper towel. A small piece of aluminum foil should be placed over the mouth. The foil should be folded around the flask’s neck. Use a rubber band to hold the foil in place. A straight pin can be used to make a tiny hole in the middle of the foil. Make sure the hole is not blocked partially by aluminum foil. The flask, rubber band, and foil cap should be weighed to within a milligram. Gini Egan’s revisions are greatly appreciated. [5]

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